Most listings are in the $10's per square foot per year. The Harrison County region is going through a a rise in rates. In the last 3 months, the median rate increased $15 per sqft per year.
In the last 90 days, 10 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 80% of the available leases in the Harrison County are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 240 sqft. Most buildings in this market are approximately 1 floors. Most buildings in this market were built in 2000 and are Class B.